What’s new: Windows Hello Multi-camera Support: When you have both an external and internal Windows Hello camera on your PC, you can now set your external camera as the default camera.
Windows Defender Application Guard Performance: Microsoft has improved the performance of WDAG.
Windows Defender Application Guard performance improvements including optimizing document opening scenario times.
WDAG is a feature that lets administrators configure applications to run in an isolated, virtualized container for security. Microsoft says opening documents, in particular, should be faster.
WMI Group Policy Performance: Microsoft has improved Windows Management Instrumentation (WMI) Group Policy Service (GPSVC) and made it perform more quickly “to support remote work scenarios.”
Since 21H1 has not yet been made available to the public at this time there may be other updates or new features included such as “News & Interest” which may be rolled out in small groups of Windows users over the coming weeks or months.
Protect your current version of Windows before installing 21H1: Create a “Full” (entire disk drive, not just the Windows partition). Should anything go wrong during the update to 21H1 you can use the backup to restore your current version of Windows.